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SEGMENT INFORMATION - Operating Segments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Disclosure of operating segments [line items]          
Revenues $ 6,482 $ 5,429 $ 12,783 $ 10,821  
Costs attributed to revenues (3,797) (3,054) (7,327) (6,058)  
General and administrative expenses (114) (108) (223) (205)  
Other (expense) income (65) (109) (123) (182)  
Interest expense (1,073) (909) (2,120) (1,808)  
Depreciation and amortization expense (1,095) (941) (2,170) (1,901)  
Deferred taxes (35) 44 16 82  
Mark-to-market and other 153 (88) (191) (82)  
Share of (losses) earnings from associates 33 (12) (8) 111 $ 627
Net income attributable to non-controlling interest (445) (183) (654) (584)  
Net income (loss) attributable to partnership 44 69 (17) 194  
Utilities          
Disclosure of operating segments [line items]          
Revenues 2,365 2,187 4,702 4,317  
Transport          
Disclosure of operating segments [line items]          
Revenues 1,072 1,150 2,118 2,324  
Midstream          
Disclosure of operating segments [line items]          
Revenues 1,916 984 3,698 2,033  
Operating segments          
Disclosure of operating segments [line items]          
Revenues 2,217 1,945 4,434 3,881  
Costs attributed to revenues (961) (799) (1,946) (1,586)  
General and administrative expenses (114) (108) (223) (205)  
Other (expense) income 1 14 30 29  
Interest expense (441) (414) (884) (835)  
FFO 702 638 1,411 1,284  
Depreciation and amortization expense (464) (421) (920) (846)  
Deferred taxes (25) 29 (6) 33  
Mark-to-market and other (169) (177) (502) (277)  
Share of (losses) earnings from associates 0 0 0 0  
Net income attributable to non-controlling interest 0 0 0 0  
Net income (loss) attributable to partnership 44 69 (17) 194  
Operating segments | Utilities          
Disclosure of operating segments [line items]          
Revenues 742 676 1,484 1,360  
Costs attributed to revenues (405) (358) (812) (718)  
General and administrative expenses 0 0 0 0  
Other (expense) income (27) (28) (50) (62)  
Interest expense (114) (103) (225) (201)  
FFO 196 187 397 379  
Operating segments | Transport          
Disclosure of operating segments [line items]          
Revenues 652 618 1,281 1,199  
Costs attributed to revenues (230) (210) (473) (396)  
General and administrative expenses 0 0 0 0  
Other (expense) income (8) (11) (11) (17)  
Interest expense (103) (93) (203) (194)  
FFO 311 304 594 592  
Operating segments | Midstream          
Disclosure of operating segments [line items]          
Revenues 477 385 972 810  
Costs attributed to revenues (208) (146) (421) (307)  
General and administrative expenses 0 0 0 0  
Other (expense) income (3) (4) (10) (12)  
Interest expense (83) (78) (168) (165)  
FFO 183 157 373 326  
Operating segments | Data          
Disclosure of operating segments [line items]          
Revenues 346 266 697 512  
Costs attributed to revenues (118) (85) (240) (165)  
General and administrative expenses 0 0 0 0  
Other (expense) income 4 6 11 12  
Interest expense (78) (74) (165) (144)  
FFO 154 113 303 215  
Operating segments | Corporate          
Disclosure of operating segments [line items]          
Revenues 0 0 0 0  
Costs attributed to revenues 0 0 0 0  
General and administrative expenses (114) (108) (223) (205)  
Other (expense) income 35 51 90 108  
Interest expense (63) (66) (123) (131)  
FFO (142) (123) (256) (228)  
Material reconciling items | Total for all associates          
Disclosure of operating segments [line items]          
Revenues (574) (478) (1,079) (946)  
Costs attributed to revenues 196 132 396 257  
General and administrative expenses 0 0 0 0  
Other (expense) income 2 7 (3) 17  
Interest expense 99 91 192 190  
Depreciation and amortization expense 136 114 250 234  
Deferred taxes (3) (19) (13) (22)  
Mark-to-market and other 122 177 253 171  
Share of (losses) earnings from associates 22 (24) 4 99  
Net income attributable to non-controlling interest 0 0 0 0  
Net income (loss) attributable to partnership 0 0 0 0  
Material reconciling items | Non-controlling interests          
Disclosure of operating segments [line items]          
Revenues 4,839 3,962 9,428 7,886  
Costs attributed to revenues (3,032) (2,387) (5,777) (4,729)  
General and administrative expenses 0 0 0 0  
Other (expense) income (68) (130) (150) (228)  
Interest expense (731) (586) (1,428) (1,163)  
Depreciation and amortization expense (767) (634) (1,500) (1,289)  
Deferred taxes (7) 34 35 71  
Mark-to-market and other 200 (88) 58 24  
Share of (losses) earnings from associates 11 12 (12) 12  
Net income attributable to non-controlling interest (445) (183) (654) (584)  
Net income (loss) attributable to partnership $ 0 $ 0 $ 0 $ 0